Django DRF 视图过滤多对多查询集

Posted 2023-02-26

【中文标题】Django DRF 视图过滤多对多查询集

【英文标题】：Django DRF views filter ManyToMany queryset

【发布时间】：2018-11-16 15:35:40

【问题描述】：

有两种型号，class User(Model) 和

class Loan(Model):
    parents = models.ManyToManyField(User, related_name='parents', verbose_name='Родители') # .objects.all().filter(user_type=User.PARENT)
    children = models.ManyToManyField(User, related_name='children', verbose_name='Дети') #.objects.all().filter(user_type=User.CHILD)

和基于 DRF 的视图

class ChildrenViewset(viewsets.ModelViewSet):
    queryset = User.objects.all()

    def get_queryset(self):
        queryset = User.objects.all()
        # TODO here i need to write filter
        return queryset

如何过滤查询集以选择定义父级的所有子级？

我有一些parent_identity（可以叫id或pk）

我期望看到的：

queryset = User.objects.filter(children__loan_set__parent__identoty=parent_identity)
return queryset

【参考方案1】：

完成

class ChildrenViewset(viewsets.ModelViewSet):
    queryset = auth_models.User.objects.all()
    serializer_class = auth_serializers.UserModelSerializer

    def get_queryset(self):
        queryset = auth_models.User.objects.all()

        parent_identity = self.request.query_params.get('parent', None)
        if parent_identity is not None:
            queryset = queryset.filter(
                Q(children__parents__identity=parent_identity) |
                Q(children__parents__email=parent_identity) |
                Q(children__parents__phone=parent_identity)
            )
        return queryset